摘要
提出了一种基于OFDM CDMA系统的新型时频2维联合扩频的方法,详细介绍了相应的系统结构以及接收机中不同的解扩合并方式.仿真结果表明,在时频选择性衰落信道中使用联合扩频方式的系统性能要优于MC CDMA系统.
A novel two-dimensional joint time-frequency spreading methods for OFDM-CDMA(orthogonal frequency division multiplexing-code division multiple access) is proposed. Then we introduce the system with our proposed spreading method and different combining schemes at the receiver. The simulation results show that the performance of the system with joint time-frequency spreading method is better than that of multi-carrier-CDMA under the time-frequency selective fading channel.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2004年第z2期102-106,共5页
Journal of Beijing University of Posts and Telecommunications
基金
国家"863计划"项目(2003AA123310)
关键词
正交频分复用
码分多址
下行
orthogonal frequency division multiplexing
code division multiple access
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